Modulating physical, chemical, and biological properties of silver nanoparticles obtained by green synthesis using different parts of the tree Handroanthus heptaphyllus (Vell.) Mattos

Abstract

Green synthesis of silver nanoparticles (AgNPs) is already widely used, however, it presents challenges. This work describes a way to modulate the physicochemical characteristics of AgNPs using green synthesis and aqueous extract from different parts of Handroanthus heptaphyllus. The progress of the synthesis reaction, the physicochemical characteristics, and the biological activity against Escherichia coli and Staphylococcus aureus of the AgNPs were evaluated. Aqueous extracts of the vegetative parts of the plant synthesized AgNPs with higher hydrodynamic diameters, lower colloidal stability and antibacterial activity to lower concentrations when compared to the reproductive parts. Pyramidal and cubic forms of AgNPs were also found when using vegetative parts. For higher production of AgNPs with smaller hydrodynamic diameters, and greater stability it is advisable to use reproductive parts. Otherwise, for larger hydrodynamic diameters, lower stability and higher antibacterial activity, the use of vegetative parts is recommended aiming to produce AgNPs.